Help me with those questions please!! 1. Does the concentration of gibberellic a

Question

Help me with those questions please!!

1. Does the concentration of gibberellic acid have any effect on retarding or stimulating germination? If so which concentration? 0 mg/l? 0.001 mg/l? 0.01 mg/l? 0.1 mg/l? 1.0 mg/l? or 10 mg/l? Why is this concentration the best and why won' t the other concentrations work?

2. Does the concentration of kinetin have any effect on retarding or stimulating senescence? If so whcih concentration? 0 mg/l? 0.001 mg/l? 0.01 mg/l? 0.1 mg/l? 1.0 mg/l? or 10 mg/l? Why is this concentration the best and why won' t the other concentrations work?

3. What is a possible mechanism to explain the action of kinetin on senescence?

Explanation / Answer

1.Yes Concentration of Gibberellic acid has stimulative effect on germination. Generally GA3 concentration is calculated in parts per million ppm. it can work from 50-250ppm. But this case 1mg/ ml will be sufficient for action.It doesnt mean that the other concentration wont work, the activity will vary and may not be the optimum effect.

2. Kinetin is a synthetic cytokinin. It retards senescence. I have seen it woking even from 0.02mg/ml. It doesnt mean that the other concentration wont work, the activity will vary and may not be the optimum effect.

3. The mechenism of retarding senescence by cytokinin is still a current area of research. However it is known to to be involved in chlorophyll tetrapyrrol biosynthesis and degradation of chlorophyll A and B.

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